Tripolar plug: Difference between revisions
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{{Short description|Italian telephone plug}} |
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[[Image:Telefonadapter 07.jpg|right|250px]] |
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{{Unreferenced|date=May 2019|bot=noref (GreenC bot)}} |
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The '''telefonic tripolar plug''' is the first type of [[telephone plug]] used in [[Italy]]. |
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[[File:Telefonadapter 07.jpg|thumb|A tripolar plug-[[RJ11]] adapter]] |
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[[File:Tripolare.jpg|thumb|300px]] |
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The '''telefonic tripolar plug''' is the first type of [[telephone plug]] used in [[Italy]]. It has also been used in [[Telecommunications in Finland|Finland]], [[Telecommunications in Norway|Norway]] and [[Telecommunications in Turkey|Turkey]] in older installations. |
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==Structure== |
==Structure== |
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It uses three pins: the two on the top are joined with the [[twisted pair]] of cables bringing the signal; the third, off-center, can be used for loop through when more sockets exist. |
It uses three pins: the two on the top are joined with the [[twisted pair]] of cables bringing the signal; the third, off-center, can be used for loop through when more sockets exist. In Finland, the third pin is earth ground, but it is rarely connected. |
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Every |
Every socket complies with Italian standards. Formerly each of them was installed by SIP, now [[Telecom Italia|TIM]], and had their trademark. Sockets without trademark exist also. Since 2007, TIM no longer installs tripolar sockets in new electrical wiring systems. |
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In Finland, there is a five-pin variant with a second line. The three-pin plug is compatible with a five-hole socket. |
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==Use== |
==Use== |
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The tripolar plug |
The tripolar plug has been supplanted by the international [[RJ11]] standard, both because it is more diffused in new technology devices and because the tripolar plug isn't suitable for [[ISDN]]. |
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[[Category:Telephone connectors]] |
[[Category:Telephone connectors]] |
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[[it:Presa telefonica tripolare]] |
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Latest revision as of 01:03, 31 October 2024
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The telefonic tripolar plug is the first type of telephone plug used in Italy. It has also been used in Finland, Norway and Turkey in older installations.
Structure
[edit]It uses three pins: the two on the top are joined with the twisted pair of cables bringing the signal; the third, off-center, can be used for loop through when more sockets exist. In Finland, the third pin is earth ground, but it is rarely connected.
Every socket complies with Italian standards. Formerly each of them was installed by SIP, now TIM, and had their trademark. Sockets without trademark exist also. Since 2007, TIM no longer installs tripolar sockets in new electrical wiring systems.
In Finland, there is a five-pin variant with a second line. The three-pin plug is compatible with a five-hole socket.
Use
[edit]The tripolar plug has been supplanted by the international RJ11 standard, both because it is more diffused in new technology devices and because the tripolar plug isn't suitable for ISDN.